point frequency meaning in English

点频率

The thesis describes a prototype fractional frequency synthesizer which is supported by a project granted by the ministry of science and technology of pr china . firstly , based on the principle of pll , this paper briefly describes three basic pll components : phase detector ( pd ) , low pass filter ( lpf ) , voltage controlled oscillators ( vco ) , analyzes the linearized pll and summaries the transfer functions of third - order pll with ideal intergrator filter respectively . based on a microwave vco , the single point frequency pll frequency ranging from 2 . 2 to 2 . 5ghz is developed
首先，从锁相环的基本理论、原理出发，分析了锁相环中的三个基本部件：鉴相器、环路滤波器和压控振荡器，此后，针对线性化锁相环进行了分析，研究了在使用比例积分滤波器时，三阶锁相环的环路参数计算；在电路实现时选用了lmx2353 ，在此基础上，完成了2 . 2 ~ 2 . 5ghz范围内的小数频率合成器设计。